Aviva Bechky writes: “Every day in public libraries across San Francisco, patrons find their way to a discreet shelf and pick up titles including Alcoholics Anonymous’ Big Book, Narcotics Anonymous, and The Zen of Recovery by Mel Ash. Then, without checking out these titles, these patrons leave. They may mark up the books they take. They won’t return the materials. And, according to Doreen Horstin, manager of San Francisco Public Library’s Park branch, this is just fine.”